The FTDI_FT801 library which is available for download on our Github page has been tested and verified to work. I verified correct operation this morning using an Arduino Uno and the NHD-4.3CTP-SHIELD-V (Arduino V. 1.0.6).

Ah -- I think I see the problem. It looks like the IDE doesn't recognize the contents of the ZIP file as valid, perhaps because it couldn't find any cpp files. So, I've used the older manual installation procedure of unpacking and copying.